FIG. 2.

Two stereo views of the globular domain of nsp1. (a) Ribbon presentation of the closest conformer of nsp1 to the mean coordinates of the bundle in Fig. 1a, shown in the same orientation as in Fig. 1a. The organization of the β-strands in the barrel is indicated by the labels. (b) Same as panel a after rotation about a horizontal axis, so that one looks at one side of the β-barrel; the axes of the β-barrel and the helix α1 are nearly perpendicular to each other, and those of the barrel and the 3₁₀-helix are nearly parallel to each other.